It is!

Handguns serve a purpose, especially in tight quarters and as backup weaponry.

Inside a structure there are several concerns with discharging a weapon - noise (can make you deaf for a while), wall puncture (don't want to hurt folk unintentionally), riccochet (same as before), maneuverability (try swinging a 30-36 inch rifle around in a tight corridor or around corners).

Justice Scalia was quite thorough on the historical, analagous and legal analysis. The individual is the cornerstone to a civil guard, and the government - if it has total control over all facets of "arms" - becomes dictatorial. There have been many examples of this in other nations before and after the writing of the Constitution.

The best part of the decision to me is that one was made. This issue has been hanging around too long to be ambiguous, and the Court's decision will lead to further refinement with it as a basis.